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Charm mass dependence of the weak hamiltonian in chiral perturbation theory

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dc.contributor.author	Hernández Gamazo, Pilar
dc.contributor.author	Laine, Mikko
dc.date.accessioned	2015-04-24T10:20:27Z
dc.date.available	2015-04-24T10:20:27Z
dc.date.issued	2004
dc.identifier.citation	Hernández Gamazo, Pilar Laine, Mikko 2004 Charm mass dependence of the weak hamiltonian in chiral perturbation theory Journal of High Energy Physics 2004 09 018-1 018-19
dc.identifier.uri	http://hdl.handle.net/10550/43364
dc.description.abstract	Suppose that the weak interaction Hamiltonian of four-flavour SU(4) chiral effective theory is known, for a small charm quark mass m_c. We study how the weak Hamiltonian changes as the charm quark mass increases, by integrating it out within chiral perturbation theory to obtain a three-flavour SU(3) chiral theory. We find that the ratio of the SU(3) low-energy constants which mediate Delta I=1/2 and Delta I=3/2 transitions, increases rather rapidly with m_c, as \sim m_c ln (1/m_c). The logarithmic effect originates from 'penguin-type' charm loops, and could represent one of the reasons for the Delta I=1/2 rule.
dc.language.iso	eng
dc.relation.ispartof	Journal of High Energy Physics, 2004, vol. 2004, num. 09, p. 018-1-018-19
dc.subject	Física
dc.title	Charm mass dependence of the weak hamiltonian in chiral perturbation theory
dc.type	journal article	es_ES
dc.date.updated	2015-04-24T10:20:28Z
dc.identifier.doi	10.1088/1126-6708/2004/09/018
dc.identifier.idgrec	015967
dc.rights.accessRights	open access	es_ES